/Engine/Source/Runtime/Engine/Public/UnrealClient.h
Reads the viewport's displayed pixels into the given color buffer.
Reads the viewport's displayed pixels into a preallocated color buffer.
True if the read succeeded.
bool ReadLinearColorPixels ( [TArray](API\Runtime\Core\Containers\TArray)< [FLinearColor](API\Runtime\Core\Math\FLinearColor) > & OutputBuffer, [FReadSurfaceDataFlags](API\Runtime\RHI\FReadSurfaceDataFlags) InFlags, FIntRect InRect )